fix: defined the model for file-metadata record field in the azure sidecar

The filemetadata model was modeled as generic object in the sidecar and this was not allowing the conversion in the service. this MR will provide the data model for the file-metadata field for the dataset record.

app/sdms/src/cloud/providers/azure/sidecar/Model/Record.cs

@@ -79,7 +79,7 @@ public class Data
     public object? metadata { get; set; }
 
     [JsonProperty(PropertyName = "filemetadata")]
-    public object? filemetadata { get; set; }
+    public FileMetadata? filemetadata { get; set; }
 
     [JsonProperty(PropertyName = "type")]
     public string? type { get; set; }
@@ -119,6 +119,20 @@ public class Data
 
 }
 
+public class FileMetadata
+{
+    [JsonProperty(PropertyName = "nobjects")]
+    public long? nobjects { get; set; }
+
+    [JsonProperty(PropertyName = "size")]
+    public long? size { get; set; }
+
+    [JsonProperty(PropertyName = "type")]
+    public string? type { get; set; }
+
+}
+
+
 public class DatasetAcl
 {
     [JsonProperty(PropertyName = "admins")]